GetHostAddress(host)
Last updated November 11, 2002
Version: 1 | Requires: ColdFusion 5 | Library: NetLib
Description:
Reverse DNS lookup, provide a host name, it'll return an IP address. If the host name is invalid
an exception will be throw, so <CFTRY>/<CFCATCH>
should be used.
Return Values:
Returns an IP address.
Example:
<cfset url2 = "microsoft.com">
<cfoutput>
Host address for #url1# is #GetHostAddress(url1)#<br>
Host address for #url2# is #GetHostAddress(url2)#<br>
</cfoutput>
Parameters:
| Name | Description | Required |
|---|---|---|
| host | The host name to lookup. | Yes |
Full UDF Source:
<cfscript>
/**
* Performs a reverse DNS lookup.
*
* @param host The host name to lookup. (Required)
* @return Returns an IP address.
* @author Ben Forta (ben@forta.com)
* @version 1, November 11, 2002
*/
function GetHostAddress(host) {
// Variables
var iaclass="";
var addr="";
// Init class
iaclass=CreateObject("java", "java.net.InetAddress");
// Get address
addr=iaclass.getByName(host);
// Return the address
return addr.getHostAddress();
}
</cfscript>
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